Potter



i @hitch gisten gstrnt @ffies C. POTTER, JR., OF WESTERLY, RHODE ISLAND. Letters .Patent No'. 68,001, dated August 20, 1867.

IMPROVEMENT IN PRINTING-PRESSES.

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TO ALL WIIOM IT MAY CONCERN:

Be it known that I, C. POTTER, Jr., of Westerly, in the county of li'ashington, and State of Rhode Island, have invented a new and useful Improvement in Printing-Presses; and that the following description, taken in connection with the accompanying drawings, hereinafter referred to, forms a full and exact specification of the same, wherein I have set forth the nature and principles of my said improvement, bywrhich my inventionmay be distinguished from all others of a similar class, together with such parts as I claim, and desire to 'have secured to me by Letters Patent.

l This invention rela-tes to a new and useful improvement in that class of printing-presses known as the drun1cylinder, and which are provided wtha reciprocating form-bed.

The invention consists in an improved means foi insuring an easy and smooth movement of the form-bed, hy avoiding jars or cencussions at the termination of its strokes; said means also sierving to hold the form-bed down upon its ways when near the termination of its strokes, the fcrnrbcd having a tendency to rise at these points, and which has been hitherto prevented by gibs attached to the form-bed, hooking or projecting under the framework ofthe press-a rather expensive arrangement. In the accompanying sheet of drawings- Figure 1 is a side sectionalview of my invention, taken in the line :l: x, iig. 2.

Figure 2 a transverse vertical section of the same, taken in the line z/ y, tig. 1.

Similar letters of reference indicate like parts. i

A represents the frame of a printing-press, haring two longitudinal and parallel ways B B at its upper part, on which the form-hed C is fitted and allowed to slide freely back and forth. To the under side of the form-bed C a plate, D, is secured, having a hook projection, E, at each end of it, as shown clearly in g. 1, said projections being of wedge or taper form in their longitudinal vertical section, gradually diminishing in thickness from their inner to their outer ends. F F represent uprights, secured in the lower part of the frame A, and in which the fulcrum-pins u of levers G work. The upper ends of these levers` G are forked to receive rollers H, and their lower ends are also forked; the upper prongs b, by coming in Acontact with vertical pins or screws c in thelower part of frame A, serving'as stops to limit the movement of the levers Gin the direction indicated by the arrows 1. The lower prongs cZ of the levers Gr are forked to receive nuts e, which are provided with journals `to lit into said prongs, as shown clearly in fig. 2. These nuts e have each a bolt or setscrew,f, passing through them and against the inner ends off. Bars g are pressed hy spiral springs I I, which are fitted on parallel rods J J, in the lower part of the frame A, the bars g being also fitted on said rods. rIhe tension ofthe springs I I muy be' regula-ted by turning the screws f, the casual turning of the screws being prevented by jam-nuts h. i l 4 The operation is as follows: The bed C is moved back and forth on the ways B B hy any of the means commonly used for that purpose in cylinder printing-presses. A hook projection, E, runs under a frictionroller, H in the upper end of a lever, G, near the termination of each stroke, and as the bed passes to its` cxtreme throw the upper end of the lever G is moved or acted upon by the wedge shape of the: projection E, in the same direction as the bed C, and the springs I compressed and the momentum of the bed overcome, while :1t the same time the bed is'hcld down on the ways I3 B by the projection E under the roller H, and the expensive means hitherto employed for that purpose, and which occasion considerable friction, is avoided. The levers G, at cach end ofthe press, operate precisely alike. In order to effect a qhiet or silent movement ofthe levers l G G, it is necessary to have the inclination or wedge of Vthe hook projections E, where they rst strike the rollers H, very slight, and thc position of the upper ends of the levers with the rollers correctly adjusted in relation to them. This is accomplished by adjusting the screwsl c.

In the usual operation of a press it is often required to run it at great variations of speed, in vwhich case the tension of the springs I requiresto be altered to correspondto the increased or decreased momentum of the form-bed C. This -is readily accomplished by adjusting the screwsf, either or both of them the adjustment of one of them `willlbe suflicient. The device, as a whole, is extremely simple and eiicient.

Having thus described my invention, I claim as new, 'and desire to secure by Letters Patent- 1. The` hook projections E E, at the under side of form-bed C, in combination with the levers G G, when the latter arc arranged in such n. manner as to admit of being adjusted relatively with the former by the screws or pins c, or their equivalents, for` the` purpose specified.

2. The pivoted' nuts ein the lower parts of .the levers G G,in connection'with the screwsf, arranged as shown, or in an equivalent way, for the purpose of regulating the tension of the springs I, as set forth.

C. POTTER, JR.

Witnesses:

-SAML lL Cnoss,

JOHN GALLUP. 

